摘要:

The possibility was studied of a gradual extension of the irrigable area of the Tarlac Irrigation System, located in the alluvial plain of Luzon Island (Philippines). The extension would be made by integrating groundwater with surface water supplied from a reservoir already designed. Aquifer exploitation was studied adopting the criterion that groundwater is a very expensive resource to be turned to only in severe drought years. The objectives of the study were twofold: (a) planning the distribution of the wells (to be drilled during the various stages of the irrigation system development) so as to minimize the pumping cost; (b) establishing a policy for the well management in conjunction with the reservoir operation. Different schemes of the combined system management were analysed on the basis of the climatic and hydrological regime over the period 1950–1972. For this period the monthly water requirements for the different crops and the monthly values of aquifer recharge were computed. The economic analyses were performed using present prices of agricultural products and power together with several different hypotheses about future prices. A finite element model of the semiconfined aquifer was postulated and calibrated; the importance of the return flow from irrigation was also tested. Simulations of exploitation schemes provided a detailed forecast of the aquifer response to the irrigation demands.

ISSN:0262-6667    

DOI:10.1080/02626668309491149

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

An analytical mathematical model, based on Jacobian elliptic functions, has been used to identify feasible wellfield locations and pumping rates for large-scale abstraction from an unconfined coastal aquifer. The choice of optimum feasible wellfield strategy has been made using a simple economic model which calculates the cost of the pipelines required to transport the abstracted groundwater to a large coastal city which forms the demand centre. Results indicate that the cheapest wellfield design would be a single large wellfield. However, because of the need to maintain at least a minimum supply in the city until a new surface water source is developed, a better solution may well be to develop two smaller wellfields pumping a greater total abstraction.

ISSN:0262-6667    

DOI:10.1080/02626668309491150

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0262-6667    

DOI:10.1080/02626668309491151

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0262-6667    

DOI:10.1080/02626668309491152

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0262-6667    

DOI:10.1080/02626668309491153

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0262-6667    

DOI:10.1080/02626668309491154

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0262-6667    

DOI:10.1080/02626668309491155

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0262-6667    

DOI:10.1080/02626668309491156

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0262-6667    

DOI:10.1080/02626668309491138

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor